package com.jiuzhi.common.utils;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;

import javax.imageio.ImageIO;
import java.awt.*;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;

/**
 * @Author:hanguanglei
 * @Description:
 * @Date: Created in 2020-02-16 14:39
 * @Modified By:
 */

public class QRCodeUtil {
    private static final String CHARSET = "utf-8";

    private static final String FORMAT_NAME = "JPG";

// 二维码尺寸

    private static final int QRCODE_SIZE = 300;

// LOGO宽度

    private static final int WIDTH = 60;

// LOGO高度

    private static final int HEIGHT = 60;



    private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {

        Hashtable hints = new Hashtable();

        hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);

        hints.put(EncodeHintType.CHARACTER_SET, CHARSET);

        hints.put(EncodeHintType.MARGIN, 1);

        BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,

                hints);

        int width = bitMatrix.getWidth();

        int height = bitMatrix.getHeight();

        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

        for (int x = 0; x < width; x++) {

            for (int y = 0; y < height; y++) {

                image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);

            }

        }

        if (imgPath == null || "".equals(imgPath)) {

            return image;

        }

// 插入图片

        QRCodeUtil.insertImage(image, imgPath, needCompress);

        return image;

    }



    private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {

        File file = new File(imgPath);

        if (!file.exists()) {

            System.err.println("" + imgPath + " 该文件不存在！");

            return;

        }

        Image src = ImageIO.read(new File(imgPath));

        int width = src.getWidth(null);

        int height = src.getHeight(null);

        if (needCompress) { // 压缩LOGO

            if (width > WIDTH) {

                width = WIDTH;

            }

            if (height > HEIGHT) {

                height = HEIGHT;

            }

            Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);

            BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

            Graphics g = tag.getGraphics();

            g.drawImage(image, 0, 0, null); // 绘制缩小后的图

            g.dispose();

            src = image;

        }

// 插入LOGO

        Graphics2D graph = source.createGraphics();

        int x = (QRCODE_SIZE - width) / 2;

        int y = (QRCODE_SIZE - height) / 2;

        graph.drawImage(src, x, y, width, height, null);

        Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);

        graph.setStroke(new BasicStroke(3f));

        graph.draw(shape);

        graph.dispose();

    }



    public static void encode(String content, String imgPath, String destPath, boolean needCompress) throws Exception {

        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        mkdirs(destPath);

        ImageIO.write(image, FORMAT_NAME, new File(destPath));

    }



    public static BufferedImage encode(String content, String imgPath, boolean needCompress) throws Exception {

        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        return image;

    }



    public static void mkdirs(String destPath) {

        File file = new File(destPath);

// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir．(mkdir如果父目录不存在则会抛出异常)

        if (!file.exists() && !file.isDirectory()) {

            file.mkdirs();

        }

    }



    public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)

            throws Exception {

        BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);

        ImageIO.write(image, FORMAT_NAME, output);

    }



    public static void encode(String content, OutputStream output) throws Exception {

        QRCodeUtil.encode(content, null, output, false);

    }
}
